A new technology characterized by rapidly non-mechanical settlement of unclassified tailings was developed based on a large number of tests, and dynamic settlement and continual slurry preparation without hardening in...A new technology characterized by rapidly non-mechanical settlement of unclassified tailings was developed based on a large number of tests, and dynamic settlement and continual slurry preparation without hardening in vertical sand silo were eventually realized by the addition of an effective flocculating agent (NPA). The results show that the sedimentation velocity of interface between unclassified tailings and water after the addition of NPA increases by 10-20 times, the sedimentation mass fraction of unclassified tailings at the bottom of vertical sand silo is up to 64%, the solid particle content of waste water meets the national standard, and the side influences of NPA can be removed by the addition of fly ash. The industrial test result shows that the system, the addition manner and the equipments are rational, and the vertical sand silo is used efficiently. This developed system is simple with large throughput, and the processing cost is 2.2 yuan(RMB)/m3, only 10%-20% of that by mechanical settlement.展开更多
以陕西榆林高挥发分烟煤在中低温条件下干馏热解所得的兰炭粉末对污水处理厂剩余污泥进行调理,在对兰炭粉末及其调理前后城市污泥理化特性分析的基础上,研究经兰炭粉末调理后城市污泥的沉降、浓缩、脱水性能的改善,并通过Zeta电位、显...以陕西榆林高挥发分烟煤在中低温条件下干馏热解所得的兰炭粉末对污水处理厂剩余污泥进行调理,在对兰炭粉末及其调理前后城市污泥理化特性分析的基础上,研究经兰炭粉末调理后城市污泥的沉降、浓缩、脱水性能的改善,并通过Zeta电位、显微镜、扫描电镜、红外光谱分析,探讨了兰炭粉末调理污泥的机理。实验结果表明:兰炭粉末按质量比(兰炭粉末/干污泥)为250%投加时,污泥过滤比阻由3.22×10^(13)m/kg降到了4.33×10^(11)m/kg,沉降速率由3.0 m L/min提高到了34.3 m L/min,污泥浓缩含水率也从98.6%降到了91.2%,滤饼含水率从87.8%降到了63.6%,污泥的热值从10.68 MJ/kg提高到21.77 MJ/kg。兰炭粉末调理污泥的机理主要是通过吸附作用改善污泥絮凝性能,在抽滤过程中通过构建骨架结构以保持泥饼的高渗透性,减弱污泥亲水性,增强污泥疏水性。展开更多
基金Project(2006BAB02A03) supported by National Key Technology Research and Development ProgramProject(2006BA02B05) supported by Key Programs for Science and Technology Development of China during the 11th Five Year
文摘A new technology characterized by rapidly non-mechanical settlement of unclassified tailings was developed based on a large number of tests, and dynamic settlement and continual slurry preparation without hardening in vertical sand silo were eventually realized by the addition of an effective flocculating agent (NPA). The results show that the sedimentation velocity of interface between unclassified tailings and water after the addition of NPA increases by 10-20 times, the sedimentation mass fraction of unclassified tailings at the bottom of vertical sand silo is up to 64%, the solid particle content of waste water meets the national standard, and the side influences of NPA can be removed by the addition of fly ash. The industrial test result shows that the system, the addition manner and the equipments are rational, and the vertical sand silo is used efficiently. This developed system is simple with large throughput, and the processing cost is 2.2 yuan(RMB)/m3, only 10%-20% of that by mechanical settlement.
文摘以陕西榆林高挥发分烟煤在中低温条件下干馏热解所得的兰炭粉末对污水处理厂剩余污泥进行调理,在对兰炭粉末及其调理前后城市污泥理化特性分析的基础上,研究经兰炭粉末调理后城市污泥的沉降、浓缩、脱水性能的改善,并通过Zeta电位、显微镜、扫描电镜、红外光谱分析,探讨了兰炭粉末调理污泥的机理。实验结果表明:兰炭粉末按质量比(兰炭粉末/干污泥)为250%投加时,污泥过滤比阻由3.22×10^(13)m/kg降到了4.33×10^(11)m/kg,沉降速率由3.0 m L/min提高到了34.3 m L/min,污泥浓缩含水率也从98.6%降到了91.2%,滤饼含水率从87.8%降到了63.6%,污泥的热值从10.68 MJ/kg提高到21.77 MJ/kg。兰炭粉末调理污泥的机理主要是通过吸附作用改善污泥絮凝性能,在抽滤过程中通过构建骨架结构以保持泥饼的高渗透性,减弱污泥亲水性,增强污泥疏水性。
